Controlling device for carburetors of internal combustion engines



K. MAYBACH Dec. 1, 1931.

CONTROLLING DEVICE FOR CARBURETORS OF INTERNAL COMBUSTION ENGINES FiledMarch 12, 1930 2 Sheets- Sheet 1 fnwnfor:

K. MAYBACH 1,833,908

CONTROLLING DEVICE FOR CARBURETORS INTERNAL COMBUSTION ENGINES FiledMarch 12, 1930 2 Sheets-Shee 2 fn enior;

mm Dec. 1, 19::

PATENT- OFFICE my ASSIGNOB 1'0 lumena B M17176, FRIEDRICH} DIVIOI 1'03WWO OI INTERNAL COI BUSTIOR miemm Application lle'd latch 12, 1930,Serial 30. 485,221, and in Germany Kat-ch 18, 1989.

My invention relates to controlling devices for internal combustionengines and has special reference to devices of this kind in which thecontrol mechanism ofv the carburetor is influenced by means depending onthe number of revolutions of the engine, especially in automobiles.

Generally such means comprise a centrifugal governor driven by theengine and working directly on the control mechanism of its carburetoror carburetors. My invention refers to a device in which the centrifugalgovernor does not directly influence the control mechanism but works ona valve or the like controlling a vacuum by means of which the influenceon the carburetor is exerted. It will be understood best when havingreference to the drawings which represent an exam le embodying myinvention.

he figures are drawn in a diagrammatical manner because in this way thenature of my invention can be explained best. All of them represent thesame example, only in difierent ositions of the'workingparts.

Fig. 1 s ows the parts of the device before the motor is started. InFig. 2 the relative positions of the component parts of the device are.shown when the motor is running at normal speed; whereas Fig. 3represents the positions with the motor running at higher S ec The motoris indicated at M and there is an auxiliary machine, for example adynamo for lighting and or ignition driven by the motor in any usual wayby gears or by means of a chain. To this latter machine a centrifugalgovernor is attached. Attaching the centrifugal governor to such anauxiliary machine having a free shaft end for example has the advantagethat my device need not be provided for the motor from the beginning butcan be attached later without difficulty to any motor for which mydevice may be desired.

The outcoming shaft of the machine is indicated at 1. By means of a bush2 or the like arms 3 having weights 4 at their ends are connected toshaft 1. Other arms 5 connect to member 6 and on rotation tend to drawthis member towards shaft 1 against the pressure of com ress'ion spring7.

Mem er 6 is connected to a non-rotating shaft 8 belonging to a kind ofslide valve or the like. There are discs or projections 31, 32 and 33fixed to said shaft 8 adapted to slide within space 30 and to open orclose the ends of pipe lines 10, 10', 11, 13 and 13'. Pipe lines 10 and10 lead to the open air or some place within the motor in which thenormal atmospheric pressure predominates, for exampleto the crank caseor the like. Pipe line 11 leads to a place of reduced air pressure, forexample to the gas intake 12 of the motor or to a vacuum accumulatorwhich may be exhausted by a special vacuum pump for instance. Pipe line13 is connected to one end of cylinder 14, whereas pipe line 13' isconnected to the other end thereof. Piston 15 is adapted to be movedwithin cylinder 14 by means of the vacuum bein connected to one end orto the other end 0% cylinder 14, depending on the position of shaft 8and its projections 31, 32 and 33. Piston rod 16 is adapted to pushagainst onearm of crank lever 17 connected to shaft 18. The other arm ofcrank lever 17 is connected to piston rod 23 and piston 24 slidingwithin cylinder 21 against the pressure of compression spring 22. Theupper end of cylinder 21 is shaped into a rod 21 which is connected toone end of crank lever 20, the other end being provided with a pedalThis crank lever is journaled at 19.

There is a lever 25 rigidly connected to shaft 18 and to its end rod 26is fastened.

The upper end of this rod is connected to one arm of crank lever 27journaled at 28. The other arm of crank lever 27 b means of rod 29 isconnected to lever 39 w ich is inifixed connection to throttle valve 40.The operation of the entire as follows:

Fig. 1 represents the positionbefore starting the motor. Pipe line 11 isin connection with line 13 and pipe line 10 is connected to line 13'.Consequently piston 15 is drawn to the right hand side and rod 16 isheld from m'oving to the left.

Upon starting the motor by pushing down mechanism is pedal and bringinglever 20 into the'dotted position, lever 17 is moved into its dottedposition also. Upon increase of speed governor 2, 3, 4, 5 begins to workand to shift shaft 8 towards the left hand side into the positionrepresented in F ig. 2. This position may be called the middle position;because upon further increase in speed the position represented in Fig.3 will be reached, where- 1 as a decrease of velocity causes thepositionv pushing down pedal 20, but spring 22 is compressed withincylinder 21 thus allowing for shaft 18 to be turned. Rod 26. by thisturning of shaft 18 is moved upward and by means of crank lever 27, rod29 and lever 39 throttle 40 is closed. Consequently the speed of themotor is reduced; within a short time the mechanism comes again to theposition represented in Fig. 1 and immediately to that of Fig. 2. Thusthe motor tends to stick to a uniform velocity of revolutions as long asthe pedal is held in its downward position. Of course, the centrifugalgovernor together with its slide valve may be attached to any shaftrevolving constantly with the motor.

said piston and said control lever; a lever adapted to be operated byfoot; and a. oneway resilient connection between said foot lever andsaid control lever.

KARL MAYBACH.

Instead of controlling the throttle in the I intake, the air or fuelfeeding openings in the carburetor may be. controlled also.

I do not Want to be limited to the details described or shown in thedrawings as many variations will occur to those skilled in the art.

What I claim is:

1. In a motor a device of the kind described comprising a centrifugalgovernor driven by said motor; a vacuum container; a valve operated bysaid governor; a cylinder and a piston therein; said valve being adaptedalternately to connect the two sides of said cylinder with said vacuumcontainer; and one-way connecting means for transmitting the movement ofsaid piston to the lever controlling the fuel mixture entering saidmotor.

2. In a motor a device of the kind described comprising a centrifugalgovernor driven by said motor; a vacuum container; a valve operated bysaid governor; a cylinder and piston therein; said valve being adaptedalternately to connect the two sides of said cylinder with said vacuumcontainer; a lever for controlling the fuel mixture entering said motor;one-way connecting. means between

